JPS61211111A - Control device for car air conditioner - Google Patents

Abstract

PURPOSE:To enable a simple composition of circuits to select the blow-off mode, and also enable a heater to start and shut down by allowing a interlock switch to be linked with temperature adjusting members so as to enable the switch to select a contact point which selects the stated air blow-off mode in relation to start-up and shut down of a cooler. CONSTITUTION:A rotary damper 3 which selects the air blow-off mode of an air conditioner, is rotated by a reversible DC motor 1, the rotational direction of which (1) is controlled by a switch-over switch 11. And a position detecting switch 20 is connected with the damper 3 enabling one out of numbers of blow- off modes to be selected where traveling contacts 21 and 22 are linked with the damper 3. In addition, an interlock switch 31 is provided including a traveling switch 32 which is linked with temperature adjust members such as an air mix damper 10 and the like. And both switches 20 and 31 are connected each other through a manual switch panel 14 which includes starting switches 15 through 18 that select the blow-off mode, automatic switches 19a and 19b, and switches 40a and 40b for a ON/OFF control of a compressor.

Description

[Detailed Description of the Invention] [Summary of the Invention] The present invention provides a car air conditioner control device that uses a reversible DC motor to automatically select an air blowing mode, in which a switch circuit for selecting the air blowing mode is shared. In order to be able to automatically start and stop the heater using a temperature control member, the heater can be started and stopped using a specific contact among a plurality of contacts that open and close in conjunction with the temperature control member. It is connected to.

[Industrial application field]

The present invention relates to an operation control device having a function of automatically selecting one of a plurality of air blowing modes in a car air conditioner control device.

[Conventional technology]

Among the operation control devices for this type of automotive air conditioner, there is a known operation control device that automatically selects a suction mode or a blowout mode.

A known operation control device is configured to operate a movable member that selects a blowing mode, for example, by the output of an arithmetic circuit that controls automatic temperature control or a drive circuit connected to the output side of the arithmetic circuit. In particular, in known devices, the number of movable members for selecting the blowout mode is approximately equal to the number of blowout modes, and the number of drive circuits is also approximately the same as the number of movable members.

[Problem that the invention seeks to solve]

However, when attempting to reduce the number of movable members and use, for example, a rotary damper to select each blowout mode such as vent, heater, pie level, etc., 1
Since it is necessary to control the position of two movable members in stages, which complicates the adjustment of the electric circuit, etc., a reversible rotating DC motor is used as the drive source for the movable member, and a position detection switch that feeds back the rotational position is used. There is a need for a simple electro-mechanical construction using a temperature control member and an interlocking switch that mechanically interlocks with the temperature regulating member.

It is an object of the present invention to meet this demand and provide a car air conditioner control device having an electro-mechanical configuration that can also be used to operate and stop a heater.

Means for Solving Problem C] For this reason, the present invention provides a reversible rotary DC motor that selects one from a plurality of air blowing modes, and a reversible rotating DC motor that selects one of the plurality of air blowing modes according to the rotational position of the DC motor. a position detection switch for position feedback comprising a plurality of electrode pairs for opening and closing an energizing circuit so as to select one of the electrode pairs; an interlocking switch having a plurality of contacts for selecting one; and a switching switch for selecting the plurality of contacts of the interlocking switch depending on whether the cooler is activated or stopped;
Furthermore, among the plurality of contacts of the interlocking switch, a contact for selecting an upper blowout mode among the plurality of blowout modes when the cooler is stopped is connected to an operation stop circuit of the heater. .

[Effect]

In such a configuration, the interlocking switch operates in conjunction with the temperature control member, and further selects a contact point for selecting a predetermined air blowing mode in connection with activation and deactivation of the cooler, and the position detection means responds to this by selecting a contact point for selecting a predetermined air blowing mode. Rotate to the position that achieves the selected air blowing mode.

On the other hand, when the interlock switch selects the contact point that selects the top blow mode when the cooler is stopped, the deactivation circuit stops the heater regardless of whether the cooler is activated or stopped;
A deactivation circuit also activates the heater when this contact is not selected.

Therefore, the heater can be activated and stopped appropriately by being switched only in a predetermined temperature adjustment area where the temperature adjustment member is located on the cooling side, and since the contacts can be shared, the circuit configuration is not complicated. It is possible to control the selection of the air blowing mode and the activation and deactivation of the heater.

〔Example〕

FIG. 1 shows a first embodiment of the present invention, in which the main parts of an operation control device for an automobile air conditioner are represented by electric circuits.

In FIG. 1, a DC motor 1 is reversibly energized and rotates in accordance with the direction of the current. This motor 1 is the second
The rotary damper 3, which is a movable member arranged in the air conditioning bag W2 shown in the figure, is reversibly rotated about its shaft 4, and there is a gap between the output shaft of the motor 1 and the shaft 4 of the rotary damper 3. It is assumed that an appropriate speed reduction mechanism is provided.

The rotary damper 3 is rotationally displaced around the axis 4, and selectively puts the air delivery hole 5 into communication with the three air outlets 6, 7.8.

In this case, when the air outlet 5 communicates with the vent outlet 6, the air blown from the air device 2 is blown upward into the vehicle interior, and when the air outlet 6 communicates with the heater outlet lower, the blown air When the air is blown out both above and below the vehicle interior (pie level blowout) and communicated with the heater blowout lower,
The blown air is blown downward into the vehicle interior, and when it communicates with the defroster sky and evening air outlet 8, the blown air is blown toward the front windshield.

The air conditioner 2 includes an evaporator 43 as a cooler, a heater core 9 as a heater disposed across about half of the passage, and an air mix damper 10 as a temperature control member disposed on the side thereof. It is. The air mix damper 10 adjusts and changes the temperature of the air blown from the air conditioner 2 by a drive device 12B controlled by an automatic temperature control circuit 12A, and constitutes a known automatic temperature control mechanism.

The DC motor 1 is a two-brush type, and the direction of rotation is reversed when current flows from one terminal to the other and vice versa. The switch 11 switches the direction of the current supplied to the motor 1, and includes two relay switches 12 and 13. Each relay switch selectively connects each energizing terminal of the motor 1 to one end and the other end of the DC power supply, and when the relay is de-energized, the movable contact is connected to the ground terminal, and the relay is connected to the power supply terminal when it is in the energized state. Therefore, the direction of the current flowing through the motor l is reversed depending on whether one of the relay switches is energized or the other is energized.

The manual switch panel 14 has four start switches 15 for selecting one of the four blowout modes of the air conditioner.
, 16, 17, and 18, and an automatic switch 19a that instructs to automatically select one of these blowout modes.
19b and a switch 40a for selecting whether the compressor is on or off.

40b. It is assumed that these switches 15 to 19 are mechanically constructed so that only one switch contact is always closed. Switch 40a.

40b is a switch that operates in conjunction with a switch (not shown) that commands the operation and stop of the cooler, and when the cooler is activated, the ON contact is
When stopped, the OFF contact is closed.

The position detection switch 20 is connected to the rotary damper 3 shown in FIG. 2 via a link or the like, and a group of contacts described below are selectively opened and closed depending on the position of the rotary damper 3. The position detection switch 20 has two movable contacts 21.2.
2, and four pairs of fixed contacts connected to correspond to the contacts of the manual switches 15 to 18, respectively. These movable contacts and the four pairs of fixed contacts are selectively opened and closed by moving relative to each other according to the actual position of the rotary damper 3 as the movable contacts 21 and 22 move in conjunction with the rotary damper 3. .

Of the four pairs of fixed contacts, 23 and 24 are a first common contact and a second common contact, respectively, and each common contact has a pattern with a required length corresponding to each blowout mode of the rotary damper 3. Opening and closing of the contacts 25, 26.27 and 2B, 29.3.0 and each movable contact 21.22 is detected.

This opening/closing, along with opening/closing of the manual switches 15 to 18, has the role of controlling the supply of power to the energizing circuits of the first and second relay switches 12, 13.

The plurality of contacts in the manual switches 15 to 18 and the position detection switch 20 described above are divided into two relay switches 12.1 depending on the combination of opening and closing of the contacts.
3 is selected, and the energization and rotation of the DC motor 1 are controlled so that one blowout mode commanded by one of the manual switches 15 to 18 is realized.

Here, if the vent Suita mode is commanded by closing the manual switch 15, the first movable contact 21 connected to this switch 15 is always connected to the first common contact 23 via the fixed contact 25, and the 1 relay switch 12 is energized and its contacts are connected to the power supply terminal side. Therefore, a current flows through the DC motor 1 from the left to the right in the figure, and the rotation of the motor 1 causes the rotary damper 3 to move toward the shaft 4 in FIG.
It rotates counterclockwise around , and reaches a position where the air delivery hole 5 communicates with the vent outlet 6. When the rotary damper 3 reaches this position, the first movable contact 21 of the position detection switch 20 is disconnected from the fixed contact 25 at the position indicated as rVJ within the frame of the position detection switch 20, and the first relay switch 12 is turned off. The DC motor 1 is deenergized,
Stop rotation.

Next, when the pie level blowing mode is commanded by closing the manual switch 16, the first or second movable contact 21.
22 is in contact with the fixed contact 26 or 28 (that is, the actual blowing mode does not match the commanded position), either the first or second relay switch 12.13 is energized and the DC motor 1 rotates in either direction, and rotates the rotary damper 3 until the movable contacts 21 and 22 reach the position labeled "B/L", and the air delivery hole 5
stops the rotary damper 3 at the position shown in FIG.

Similarly, when the heater blow mode is commanded by the manual switch 17 and when the defroster blow mode is commanded by the manual switch 18, the movable contacts 21 and 22 are in the positions indicated as rHJ and rDJ, respectively. The DC motor 1 is rotated until the rotary damper 3 moves and then stopped.

The interlock switch 31 is connected to the movement of the air mix damper 10 of the air conditioner 2, which functions as an automatic temperature control mechanism, and is connected to the drive device 12B via a suitable link. The interlocking switch 31 includes a movable contact 32 that interlocks with the position of the air mix damper lO, and a position detection switch 20.
Therefore, each of the manual switches 15 and 17 and the switches 40a and 40a correspond to the plurality of fixed contacts of the
A plurality of fixed contacts 33a, 33b, 34a, 34 connected in parallel via 0b, 19a, 19b.
A common terminal 36 is provided for connecting the movable contact 32 to each of the fixed contacts 33a to 34b in accordance with the movement of the movable contact 32. diode 37
, 38 and 39 are the interlocking switch 31 and the position detection switch 2
This is to prevent current from running around when connecting 0 to 0.

Further, the fixed contacts 33a to 34b of the interlocking switch 31 are
Automatic switches 19a, 19 in manual switch panel 14
When b is closed, the diode 37.38 of the position detection switch 20 is connected instead of the switch 15.17. In this case, switches 40a and 4Qb are ON indicating cooler operation.
In this position, the fixed contact 25 is grounded via the diode 37 when the contact 33a corresponds to vent blowout. Further, the contact 34a grounds the fixed contacts 27 and 29 via the diode 38 when the heater is blown out.

Further, when neither of the contacts 33a and 34a is connected to the movable contact 32, the transistor 14a is turned on to ground the fixed contacts 26 and 28.

On the other hand, the switches 40a and 40b are OF indicating that the cooler is stopped.
When in the F position, the fixed contact 25 of the position detection switch 20 is grounded when the contact 33b of the interlock switch 31 corresponds to vent blowout. Further, when the contact 34b corresponds to heater blowout, the fixed contacts 27 and 29 are grounded. moreover,
Contact point 33b.

When none of the contacts 34b are connected to the movable contacts, the transistor 14a turns on, grounding the fixed contacts 26, 28.

In this way, the interlocking switch 31 interlocks with the position of the air mix damper 10 when in the automatic mode to control the vent blowout (V), heater blowout (H), and
By selectively grounding each fixed contact of the pie level blowout (B/L), the motor 1 is reversibly rotated to automatically select each of the above blowout modes. In this case, switch 40a.

The correspondence relationship between the blowing mode and the position of the air mix damper 10 is switched depending on the on state of the air mix damper 40b.

As described above, the contact 33b of the interlocking switch 31 connects the contact 25 of the position detection switch 20 to ground so that when the cooler is stopped, the air mix damper 10 is at a predetermined position on the cooling side and the vent is blown out. , and is also connected to a coil 44a that energizes a solenoid valve 44 provided in a flow path for circulating engine cooling water to the heater core 9. The solenoid valve 44 is of a normally open type, and its coil 44a is energized and closed only when the air mix damper 10 is in a predetermined position on the cooling side and the movable contact 32 is in contact with the connection 33b. Thereby, the heater core 9 does not radiate unnecessary heat.

[Brief Description of the Drawings] Figures 1 and 2 show an embodiment of the present invention.
FIG. 1 is its electrical wiring diagram, and FIG. 2 is a layout diagram of the air function elements. 1...DC motor, 3...Rotary damper, 6,7
゜8...Air outlet, 9...Heater core (heater), 1
0... Air mix damper (temperature adjustment member), 20.
...Position detection switch, 31...Interlocking switch, 33
a. 33b, 34a, 34b... Contact, 40... Changeover switch, 43... Evaporator (cooler), 44...
... Solenoid valve, 44a... Coil (operation stop circuit).

Claims (1)

[Scope of Claims] A reversible rotary DC motor that selects one of a plurality of air blowing modes, and one of the plurality of air blowing modes that is selected according to a rotational position of the DC motor. a position detection switch for position feedback comprising a plurality of electrode pairs for opening and closing an energizing circuit; and a plurality of contacts for selecting one of the plurality of electrode pairs of the position detection switch in conjunction with a temperature regulating member. a changeover switch that selects the plurality of contacts of the interlocking switch depending on whether the cooler is activated or stopped; A car air conditioner control device comprising: a contact point for selecting an upper blowing mode among the plurality of blowing modes when the plurality of blowing modes is selected, and a contact point that sometimes selects an upper blowing mode from among the plurality of blowing modes, connected to an operation stop circuit of a heater.